Energy funnels: A large dendritic zinc porphyrin heptamer (7PZn) in a C60-terminated electron-transfer relay system 7PZn-C60 (see picture) not only harvests visible light for the electron transfer to the C60 terminus, but also retards the back-electron-transfer process, thus resulting in a longer lifetime of the charge-separated state (7P-C).
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Choi et al. (2003) studied this question.
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